The Miller/Urey experiment was the first step in creating life form non-life. As I understand it, it merely created amino acids. I say "merely" but it's a pretty big step as amino acids one of the first steps in creating life. There are many hypothesis on how you get from non-life to life. RNA world, Iron/Sulfur world, among others. What we do know is carbon is the most reactive element in the universe. I have heard - I think from Neil deGrasse Tyson - that carbon is involved in over half of all known chemical reactions. It is therefore not surprising that life is carbon based. When you break down what life is made of, it's roughly proportional with how elements are distributed in the Universe.

As far as chemical evolution, what we need is to get from basic natural chemical reactions to a self-replicating molecule. We have demonstrated many of the steps needed in various experiments. Once we have a molecule that can self-replicate, evolution takes over and the rest is history. Most theists make the common mistake. If we don't know X, therefore God.

I just noticed you're from Saudi Arabia. I know how hard it is to be an atheist in America but I can't imagine in Suadi Arabia. I'm glad you found us. At least you know you're not alone, even if I'm sure you feel lonely.

You know, there is a lecture series of Robert M. Hazen by the Teaching Company, it's called "The Origins of Life." Here the science and the history of successive discoveries, frameworks of thought, hypotheses and so are laid out very clearly.